1/*
2 * Copyright 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_AV_SYNC_SETTINGS_H
18#define ANDROID_AV_SYNC_SETTINGS_H
19
20namespace android {
21
22enum AVSyncSource : unsigned {
23    // let the system decide the best sync source
24    AVSYNC_SOURCE_DEFAULT = 0,
25    // sync to the system clock
26    AVSYNC_SOURCE_SYSTEM_CLOCK = 1,
27    // sync to the audio track
28    AVSYNC_SOURCE_AUDIO = 2,
29    // sync to the display vsync
30    AVSYNC_SOURCE_VSYNC = 3,
31    AVSYNC_SOURCE_MAX,
32};
33
34enum AVSyncAudioAdjustMode : unsigned {
35    // let the system decide the best audio adjust mode
36    AVSYNC_AUDIO_ADJUST_MODE_DEFAULT = 0,
37    // adjust audio by time stretching
38    AVSYNC_AUDIO_ADJUST_MODE_STRETCH = 1,
39    // adjust audio by resampling
40    AVSYNC_AUDIO_ADJUST_MODE_RESAMPLE = 2,
41    AVSYNC_AUDIO_ADJUST_MODE_MAX,
42};
43
44// max tolerance when adjusting playback speed to desired playback speed
45#define AVSYNC_TOLERANCE_MAX 1.0f
46
47struct AVSyncSettings {
48    AVSyncSource mSource;
49    AVSyncAudioAdjustMode mAudioAdjustMode;
50    float mTolerance;
51    AVSyncSettings()
52        : mSource(AVSYNC_SOURCE_DEFAULT),
53          mAudioAdjustMode(AVSYNC_AUDIO_ADJUST_MODE_DEFAULT),
54          mTolerance(.044f) { }
55};
56
57} // namespace android
58
59// ---------------------------------------------------------------------------
60
61#endif // ANDROID_AV_SYNC_SETTINGS_H
62